HTC Touch - Turn on backlight with any button

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Not sure is it HTC Touch or WM6, there isn't any selection for
Backlight option "Turn on backlight when a button is pressed
or the screen is tapped". After device Backlight turn off, only
button to turn back on is on/off button. Anyway i can set such
that I can also use buttons like "Call" "End Call" to turn on backlight?

Is there any solution on the above? Probably some registry changes or
edit that can allow the "Call" end "End" button to use to turn on the
backlight?

Exactly the same problem...

Or, said in a different way, I'd like to block the device (screen and buttons), and completely turn backlight off, but being able to see an "active screen".

The current implementation (turn on the screen through power button) is very unconfortable.